This one has been more than a year in the making.
The first take recording went for 28 minutes. Trust me: everything you think I ought to have included in this, I probably did at some stage. I had a very, very hard time cutting this down, and in the end, had to split it up anyway, because youtube viewers simply don't click on much above about 4 minutes, let alone 16, which is about what this has ended up as.
***I'm getting requests to hear the first take: it's gone. Chucked it out weeks ago. Listening back to it, it was flabby and slow. What you're hearing here is most of those ideas, whipped into shape, turned into one-liners rather than passages, and a few long lists of animals had to be dropped. I really wish I could have included the list of 40 or so Australian animals, but it was just too much of a halt on proceedings.
Research on animal behaviors and numbers of species was not carried out in accordance with the strictest of academic standards, I freely admit. I went all over the net following leads on interesting animal facts FAR too much to ever keep records of where I'd been, and where I got each "fact" from. There's probably a few minor numerical and mathematical errors in here, but I am not making any claim to inerrancy so I hope you'll forgive me.
Noah's long rant at the end came mainly from various articles on Wikipedia.